Short description

The battery buffered DC power supply is working according to the stand-by parallel mode and ensures in connection with a lead-acid accumulator a safe continuous DC power supply during a determined time interval in case of mains failure. The total output current is shared between supply of the loads and charging of the batteries.

The power supply is characterized by the follow

ing properties:

  • Primary switched power supply with I/U charging characteristic
  • Active power factor correction (PFC)
  • Micro-controller supported lead accumulator management
  • RS232 for monitoring and parameterization
  • Temperature tracking of the charging voltage with external temperature sensor

Technical Data 

Nominal voltage230 VAC (±15%)
Input voltage range for charging operation195,5...264,5V
Nominal frequency47 Hz...63 Hz
Power consumption380 VA
Self current consumption75mA@24V
max. nominal input current1,8 A 
max. inrush current: 35 A / 2 ms, max.

max. nominal output current

output voltage (in mains operation)                24V DC
output voltage range (with temperature tracking)26,4V DC...28,6VDC ± 0,4%

charging characteristics

I/U DIN41773

Final charging voltage without temperature tracking

26,4 V DC ± 0,4%

Deep discharge protection and load shedding20,4 V DC ± 0,4%
Max.power loss "worst-case"     40W
Efficiency 89%@ (Ui=230 V; Uo=26,4V DC; Io=Inom
Internal device protection2,5 A (T), 250 V)
Fuse DC-output circuit (external)15 A (T, UL-248)
Fuse DC-battery circuit (external)15 A (T, UL-248)
Connection in parallelyes
Connection in seriesno
Max. load message contact30 V / 0,5 A potentialfree relay-contact
Type of battery

PB-accu, maintenance-free, 

max. 170 Ah

Protective systemIP 54
Storage temperature-10°C up to 50°C
Operational temperature-10°C up to 50°C
Relative humidity≤ 95% no condensation
max. mounting height (without load reduction)2000m above sea level

Dimensions (HxWxD):

1000 x 800 x 300mm


64,5 kg



File Format
VdS certificate2021PDF